Tris -mono

Hydroxyethylimino-tris(hydroxymethyl)methane (MONO-TRIS) [7343-51-3] M 165.2, m 91 , pKes, -9.8. Crystd twice from EtOH. Dried under vacuum at 25°. 

Preparation and properties of stable salts containing mono- or bis-(pentafluorophenyl)aurate(I) and mono-, tris-, or tetrakis-(pentafluorophenyl) aurate(III) ions. Journal of the Chemical Society, Chemical Communications, (10), 353-354. 

Deoxy-a-D-ribosyl-l-phosphate 20, a key substrate in the preparation of 2 -deoxynucleosides, was stereoselectively prepared by crystallization-induced asymmetric transformation in the presence of an excess of ortho-phosphoric acid and tri( -butyl)amine under strictly anhydrous conditions (Scheme 2).7 Initial Sn2 displacement of Cl in ot-glycosyl chloride 16 by phosphoric acid resulted in a 1 1 a/p anomeric mixture of 17 and 18 due to the rapid anomerisation of the a-chloride in polar solvents. Under acidic conditions, in the presence of an excess of H3P04, an equilibration between the a and p anomers gradually changed in favour of the thermodynamically more stable a-counterpart. By selective crystallization of the mono tri( -butyl)ammonium salt of the a-phosphate from the mixture, the equilibrium could be shifted towards the desired a-D-ribosyl phosphate 18 (oc/p = 98.5 1.5), which was isolated as bis-cyclohexylammonium salt 19 and deprotected to furnish compound 20. 

Iodine combines with fluorine, chlorine and bromine, forming interhalogen compounds such as ICl, IBrs, IF . Fluorine successively adds on to iodine forming mono-, tri-, penta-, and heptafluorides of iodine ... 

CYCLOPENTADIENYLSODIUM AND SOME MONO-, TRI-, AND TETRANUCLEAR METAL CARBONYL DERIVATIVES AND CLUSTER COMPLEXES... 

Lhder these terms are known organic compds contg either two —N02, two —ONOa or two —NO groups. As a rule, they are described in this Encyclopedia under corresponding parent compds. For example, Dinitrobenzenes are described under Benzene and Dinitro-toluenes are under Toluene. If a parent compd has no other nitrated derivatives besides di-(such as mono-,, tri-, tetra-, etc — nitro- or... 

Mono-, tri- and tctra-hydratc also known. b Monohydratc also known. 

The pyrolysis of disilane forms mono-, tri-, and n- and i-tetrasilane. An insertion reaction takes place51 in which silylene reacts with an Si—H bond ... 

The importance of the polymeric form was pointed up in Fade-ometer and sunlamp tests where polyphosphites were found to be much more effective than mono (tris) phosphites derived from the same starting hydroquinones, especially when the compounds were used in conjunction with thiodipropionate esters. The data in Table IV show a comparison between a polyphosphite and a mono (tris) phosphite derived from the same substituted hydroquinone. A commonly used hindered phenolic was also tested in place of the phenolic phosphite for comparison. The protection against embrittlement obtained with the polymeric phenolic... 

Some elements, like hydrogen, oxygen, or the alkali metals, seem always to have the same valency in all of their compounds. Other elements however show different valencies thus, for example, chlorine can be mono-, tri-, penta- or heptavalent in its compounds. It is true that compounds of the same element with different valencies show different physical and chemical characteristics. 

Thermal decomposition of cis- and fraw-l-propenylcopper and their mono(tri-M-butylphosphine) complexes yields the hexadienes, with retention of configuration at the double bonds, and copper metal (293, 294). The cis isomer is configurationally unstable under the conditions of room-temperature thermal decomposition. However, the isomerization could be almost completely suppressed by performing the thermal... 

Note A bulky wingtip group is needed to produce a mono tris-NHC metal complex. 

Perborates, or peroxoborates, are usually written as if the perborate anion were BO3. The three known sodium perborates are therefore conunonly referred to as the mono-, tri-, and tetrahydrates, NaB03 H20, where n = 1, 3, and 4. However, these actually contain the cyclic dianion (8). On the basis of this structure, these compounds are more correctly referred to as anhydrous, tetrahydrate, and hexahydrate. 

Covalent mono-, tri-, tetra-, and pentavalent hahdes tend to form anionic complexes with coordination numbers of two (equation 19), four (equations 20 and 21), and six (equations 22 and 23). Such reactions take place mostly through the addition of halide anions. 

The liquid phase photolysis of dimethyl disulfide (2537 A) has been reported to produce dimethyl sulfide and dimethyl trisulfide in equal quantities, and traces of CH4 and methyl tetrasulflde. Ethyl disulfide again gave mono, tri- and tetra-sulfides with a trace of ethyl mercaptan. All irradiations were prolonged, of the order 24-48 hours. It was claimed that C-S fission in the primary photolytic dissociation... 

MONO-TRIS, 2-hydroxy-ethylimino-tris-(hydroxymethyl)-methane... 

---